. Author manuscript; available in PMC: 2011 Jul 1.

Published in final edited form as: Am J Ophthalmol. 2010 Apr 8;150(1):16–22. doi: 10.1016/j.ajo.2010.01.033

Table 3.

Intermittent exotropia patients assessed using three different near stereoacuity tests at a single clinical examination, showing proportions classified as ‘monofixation’, ‘bifixation’ and ‘uncertain.’

Fixation status	Preschool Randot (n=44)		Titmus (n=44)		Frisby (n=44)
Fixation status	bifixation ≤40 arcsec	bifixation ≤60 arcsec	bifixation ≤40 arcsec	bifixation ≤60 arcsec	bifixation ≤40 arcsec	bifixation ≤60 arcsec
Monofixation	36%^a	36%^a	48%^a	45%^a	55%^a	32%^a
Bifixation	32%	50%	43%	48%	45%	68%
Uncertain	32%	14%	9%	7%	None	None

The rate of monofixation was comparable across tests using a threshold of at least_40 arc seconds for bifixation (P>0.1 for each comparison) and using a threshold of at least 60 arc seconds for bifixation (P>0.2 for each comparison).

Monofixation was defined as stereoacuity worse than previously published age-referenced normal thresholds¹¹, ¹², ‘bifixation’ was defined as at least 40 arc seconds or at least 60 arc seconds and ‘uncertain’ was defined as worse than 40 or 60 arc seconds but within normal range for age.